Manufacture of chains.



PATENTED JAN. 20, 1903.

J. H. BAKER.

- MANUFACTURE OF CHAINS.

APPLICATION FILED FEB. 3, 1902.

R0 MODEL.

FIG. I.

FHlZ.

Fill-7-21.

FISH,

NIIIVINTOR AM $113 my.

kfl 88.8 i

UNITED STATES PATENT OFFICE.

JAMES H. BAKER, OF ALLEGHENY, PENNSYLVANIA, ASSIGNORTO JAS. H. BAKER MANUFACTURING COMPANY, OF ALLEGHENY, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

MANUFACTURE OF CHAINS.

SPECIFICATION forming part of Letters Patent No. 718,811, dated January 20, 1903.

Application filed February 8, 1902. S ri l No. 92,411. (No model.)

To aZZ whom it may concern: bars may be scarfed by shearing, in which Be it known that I, JAMES H. BAKER, a citicase the deformed portions should be rezen of the United States, residing at Allemoved. gheny, in the county of Allegheny and State It will be observed by reference to Fig. 2 5 of Pennsylvania, haveinvented or discovered that the peripheral edges of the ends 1 thus certain new and useful Improvements in the formed on the blank are very thin, so that if Manufacture of Chains, of which improvesubjected to the cutting action of the flame, ments the following is a specification. &c., in the welding-furnace these edges will The invention described herein relates to be burned away before the body of the end 10 certain improvements in welding links for portions can be raised to a Welding temperachains, &c., and has for its object the proture. In order to prevent the destruction of vision of maximum welding-surfaces without the edges and also to keep the surfaces to be increasing the length of the scarf and the prounited clean during the heating, caps 2, of tection of such surfaces as against injury or clay or other suitable material, are placed on 15 reduction during the heating of the scarfed the ends of the blank. These caps may be portions to a welding temperature. formed readyto be slipped onto the ends of In the accompanying drawings, forming a the blank or the heater may apply a coating part of this specification, Figure 1 is a View of clay or other material in a plastic condiof a portion of a heating-furnace, showing the tion before placing the blanks in the furnace. 2o linkin position to be heated. Fig. 2isa view The caps or covers should not be made so of a link with protecting-cap on its ends. thick as to prevent a rapid heating of the Fig. 3 is a view of a link having properlyends, but should be sufliciently thick to prescarfed ends, and Figs. 4 and 5 are views of vent cracking off when highly heated. When links having the scarfed ends deformed. the heated blanks are withdrawn from the 2 5 It has heretofore been the practice in makfurnace, the caps or covers can be easily ing and welding links to form the scarf by slipped off by a sharp blow or scraped 0E, shearing the bar transversely in aplane formleaving the exposed ends of the blank clean ing an acute angle with the axis of the bar. and bright for the welding operation. As is well known by all metal workers, the I claim herein as my invention o portions of the bar adjacent to the plane of 1. As an improvement in the art of making shear are deformed by the compressive action links, the method herein described,which conof the shear-blades, so that faces formed by sists in so forming the scarfs as to produce a shearing are greatly reduced in area, as illusmaximum area for a given scarf, protecting trated in Fig. 4, and the portion of the link the scarfed ends from injury and diminution 35 at the weld has a transverse area less than while being heated to a welding temperature, that of other portions of the link, and, furremoving the protector from the heated ends ther, when the scarfed blank is placed in the and welding such ends, substantially as set furnace to heat the ends to welding temperforth. ature the thin points and edges are burned 2. As an improvement in the art of making 0 away, thereby further reducing the area of links, the method herein described,which conthe surfaces to be united, as shown in Fig. 5, sists in protecting the scarfed ends of the link and frequently the weld is rendered defective from injury and diminution while being heatby the inclusion between the weld-surfaces ed to a welding temperature, removing the of portions of burned metal. protector from the heated ends and welding 5 5 In the practice of my invention the scarfs such ends, substantially as set forth.

on the ends of the blank are formed by saw- In testimony whereof I have hereunto set ing or so cutting the-bar as to avoid any commy hand.

pression or deformation of the portions adja- JAMES H. BAKER.

cent to the plane of cut, thereby insuring Witnesses: 50 maximum areas for the planes in which the DARWIN S. WOLOOTT,

cut is made, as shown in Figs. 2 and 3. The F. E. GAITHER. 

